[YouTube] Avoid crash in author extraction #2666

Job	Run time
Linter	28s
Tests (ubuntu-20.04, 2.7, cpython, core, sh)	4m 49s
Tests (ubuntu-20.04, 2.7, cpython, download, sh)	41m 36s
Tests (ubuntu-20.04, 3.5, cpython, core, sh)	59s
Tests (ubuntu-20.04, 3.5, cpython, download, sh)	38m 59s
Tests (ubuntu-20.04, 3.6, cpython, core, sh)	55s
Tests (ubuntu-20.04, 3.6, cpython, download, sh)	38m 48s
Tests (ubuntu-20.04, 3.7, cpython, core, sh)	49s
Tests (ubuntu-20.04, 3.7, cpython, download, sh)	38m 44s
Tests (ubuntu-20.04, 3.8, cpython, core, sh)	56s
Tests (ubuntu-20.04, 3.8, cpython, download, sh)	38m 31s
Tests (ubuntu-20.04, 3.9, cpython, core, sh)	44s
Tests (ubuntu-20.04, 3.9, cpython, download, sh)	38m 50s
Tests (ubuntu-20.04, pypy-2.7, cpython, core, sh)	3m 15s
Tests (ubuntu-20.04, pypy-2.7, cpython, download, sh)	38m 18s
Tests (ubuntu-20.04, pypy-3.6, cpython, core, sh)	2m 13s
Tests (ubuntu-20.04, pypy-3.6, cpython, download, sh)	39m 58s
Tests (ubuntu-20.04, pypy-3.7, cpython, core, sh)	2m 25s
Tests (ubuntu-20.04, pypy-3.7, cpython, download, sh)	43m 10s
Tests (windows-2019, 3.2, cpython, core, bat)	3m 45s
Tests (windows-2019, 3.2, cpython, download, bat)	39m 58s
Tests (ubuntu-20.04, jython, core, sh)	4m 31s
Tests (ubuntu-20.04, jython, download, sh)	1h 59m 7s
	9h 1m 48s

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